A new platform or medium comes along. You make a first-pass judgment about whether to even join it, based largely on whether you think you can cohere an inhabitable persona on it, and whether you have the time to participate on it. If you decide to give it a shot, you go on, you try a few experimental personas on for size, and as one starts to gel, you become present on the platform. There is now something it is like to be you on Platform X.
Interesting. When I most struggle with a platform, it seems to be because I'm not clear on what it's like to be me in that Platform.